update manpage for "iw help command"
update manpage for "iw help command"

bw-oss/iw,greearb/iw-ct,chunyeow/iw,CTU-IIG/802.11p-iw,cozybit/iw,greearb/iw-ct,CTU-IIG/802.11p-iw,cozybit/iw,bw-oss/iw,chunyeow/iw,Distrotech/iw,Distrotech/iw